!!! Overview
[{$pagename}] is a [OAuth 2.0] [prompt Parameter] value where the [Authorization Server] [SHOULD] prompt the [Resource Owner] to select a user account. 

[{$pagename}] is used to allow the [Resource Owner] ([End-User]) who [MAY] have multiple accounts at the [Authorization Server] to select the desired account that they might have current sessions for. If it cannot obtain an account selection choice made by the [Resource Owner], the [Authorization Server] [MUST] return an [OAuth Error], typically [account_selection_required]. 

[{$pagename}] is often implemented by using [Account Chooser].

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]